Weather on May 18 in Ottawa
Historical weather data for May 18 in Ottawa, Canada
Avg High19°C (67°F)
Avg Low8°C (46°F)
Warmest197722°C
Coldest19764°C
Based on 56 years of data from OTTAWA CDA
About This Date
May 18th in Ottawa, Canada typically brings mild spring weather, with average highs around 19°C and lows near 8°C. Over 56 years of records, the warmest May 18th was in 1977 (22°C average), while the coldest was 1976 (4°C) — a 31°F range across recorded history. Precipitation has occurred on 32% of recorded May 18th dates, with snow falling 2% of the time. The last decade has been 2.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.1°F cooler on this date compared to 20-30 years ago.
Planning for May 18th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2026 | 25°C (77°F) | 9°C (49°F) | -- |
| 2025 | 16°C (60°F) | 8°C (47°F) | -- |
| 2024 | 24°C (75°F) | 13°C (56°F) | 1 mm |
| 2023 | 16°C (61°F) | -1°C (31°F) | 0 mm |
| 2022 | 18°C (64°F) | 6°C (42°F) | 0 mm |
| 2021 | 26°C (79°F) | 13°C (55°F) | 0 mm |
| 2020 | 21°C (70°F) | 11°C (51°F) | 0 mm |
| 2019 | 16°C (60°F) | 6°C (43°F) | 12 mm |
| 2018 | 18°C (64°F) | 6°C (42°F) | 0 mm |
| 2017 | -- | 20°C (68°F) | -- |
| 2016 | 17°C (62°F) | 6°C (42°F) | 0 mm |
| 2015 | 29°C (85°F) | 11°C (51°F) | 4 mm |
| 2014 | 16°C (60°F) | 4°C (40°F) | 0 mm |
| 2013 | 23°C (73°F) | 4°C (39°F) | 0 mm |
| 2012 | 22°C (72°F) | 4°C (39°F) | 0 mm |
| 2011 | 18°C (64°F) | 9°C (48°F) | 20 mm |
| 2010 | 24°C (76°F) | 8°C (47°F) | 0 mm |
| 2009 | 14°C (58°F) | 2°C (36°F) | 0 mm |
| 2008 | 17°C (63°F) | 4°C (39°F) | 41 mm |
| 2007 | 17°C (62°F) | 2°C (35°F) | 0 mm |
| 2006 | 18°C (64°F) | 12°C (53°F) | 25 mm |
| 2005 | 14°C (58°F) | 4°C (40°F) | 3 mm |
| 2004 | 21°C (69°F) | 16°C (60°F) | 11 mm |
| 2003 | 25°C (77°F) | 8°C (46°F) | 0 mm |
| 2002 | 8°C (46°F) | 3°C (38°F) | 0 mm |
| 2001 | 21°C (69°F) | 10°C (50°F) | 51 mm |
| 2000 | 13°C (55°F) | 10°C (50°F) | 19 mm |
| 1999 | 28°C (82°F) | 16°C (60°F) | 0 mm |
| 1998 | 26°C (79°F) | 13°C (55°F) | 0 mm |
| 1997 | 17°C (63°F) | 3°C (38°F) | 1 mm |
| 1996 | 26°C (79°F) | 14°C (58°F) | 24 mm |
| 1995 | 17°C (62°F) | 4°C (39°F) | 0 mm |
| 1994 | 17°C (62°F) | 4°C (40°F) | 5 mm |
| 1993 | 17°C (63°F) | 1°C (34°F) | 0 mm |
| 1992 | 16°C (61°F) | 8°C (46°F) | 0 mm |
| 1991 | 16°C (60°F) | 4°C (40°F) | 0 mm |
| 1990 | 15°C (59°F) | 8°C (46°F) | 7 mm |
| 1989 | 30°C (86°F) | 12°C (53°F) | 0 mm |
| 1988 | 18°C (65°F) | 8°C (46°F) | 0 mm |
| 1987 | 15°C (59°F) | 11°C (51°F) | 0 mm |
| 1986 | 27°C (80°F) | 13°C (55°F) | 50 mm |
| 1985 | 15°C (59°F) | 4°C (40°F) | 0 mm |
| 1984 | 18°C (64°F) | 4°C (40°F) | 0 mm |
| 1983 | 17°C (63°F) | 0°C (32°F) | 0 mm |
| 1982 | 22°C (72°F) | 11°C (51°F) | 0 mm |
| 1981 | 13°C (56°F) | 1°C (33°F) | 0 mm |
| 1980 | 14°C (58°F) | 10°C (50°F) | 48 mm |
| 1979 | 23°C (74°F) | 6°C (42°F) | 0 mm |
| 1978 | 21°C (69°F) | 10°C (50°F) | 0 mm |
| 1977 | 24°C (76°F) | 18°C (65°F) | 0 mm |
| 1976 | 6°C (43°F) | 3°C (38°F) | 55 mm |
| 1975 | 26°C (79°F) | 11°C (52°F) | 0 mm |
| 1974 | 17°C (63°F) | 8°C (47°F) | 0 mm |
| 1973 | 9°C (48°F) | 6°C (42°F) | 57 mm |
| 1972 | 24°C (75°F) | 8°C (47°F) | 0 mm |
| 1971 | 26°C (79°F) | 9°C (49°F) | 0 mm |